Method of inhibiting the corrosive action of alkaline aqueous solutions, etc.



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5 Irwin Stone, New York, N. I. No Drawing. Application August 29, 1932,

Serial No.

50mins.

This invention relates to a method of inhibiting the corrosive action of alkaline aqueous solutions, emulsions, which may receive 6 inhibiting solutions,

and the like on iron containers the product and to rustemulsions, etc.

For years, alkaline aqueous emulsions, solutions and the like, cream, latherless shaving such for instance as vanishing creams; library paste,

furniture and linoleum polishes, etc., have been packed and sold in glass ars or similar nonmetallic containers.

In fact, it has hitherto to commercially pack products having a the contained water been deemed impossible in iron receptacles, such high water content, because attacked the iron producing iron rust which discolored the product, rendering it unsightly and the product and making sometimes wholly spoiling it commercially worthcomparatively high,

and their weight as compared with metal containers is extremely great breakage is also According to other difiiculties are overcome.

emulsion, solution or cream a and the loss due to quite an item.

the present invention these and Other features will hereinafter appear.

the form of the invention herein is added to an ordinary aqueous small quantity of the nitrite of any one of a number of metals metals, sodium The nitrite of the alkali or potassium, or of the alkaline earth metals barium, strontium or calcium, or

of the amyl organic group As little as 0.1% of sodium nitrite factory.

the cheap and easily obtained has proved effective and satis- Such an emulsion or cream can be stored in an iron container viding a cheap,

almost indefinitely, thus prostrong, and reliable package.

One non-rusting latherless shaving cream was made as follows The stearic acid was first heated to about 85 C.

The glycerine and water were then mixed together apart from the stearic acid and also heated to about 85 C. To the glycerine and water were then added was then poure oughly stirred.

the ammonia. This solution d into the stearic acid and thor- When the whole mix was cooled have all proved useful.

consists in incorporating in the producta small Carnauba wa Rosin Triethanolamine oleate 3.5 Sodium nitri e 0. 1 Water, sumcient to make 100 A solution as a library paste was made from the following formula.

Parts Starch Gum accia Glycerine Borax- Sodium nitr Oil of cloves 0.1 Water "12 While in the examples given above there was used 0.1% of the nitrite, I do not wish to be limited to the use of such proportions for I have found that as much as 3% can be used in some of the products without any deleterious effect or impairment of the product and I have also found that in some cases as little as 0.05% of the nitrite was sufficient to inhibit the rust producing tendency of the product.

Sodium nitrite is usually preferable because it is non-toxic, no irritating,. colorless, odorless, tasteless and inexpensive.

Having thusdescribed certain embodiments of the invention, what is claimed is:

1. In the art of packaging non-acid aqueous manufactured products, the method of inhibiting the otherwise normal tendency of such product to rust tin cans intended to containit, which consists in incorporating in the product a small quantity of a nitrite.

2. Inthe art of packaging non-acid aqueous manufactured products, the method of inhibiting the otherwise normal tendency of such product to rust tin cans intended to contain it, which quantity of sodium nitrite.

3. That step in the process of packaging in tin cans, non-acid aqueous emulsions, which consists in incorporating in the emulsion a quantity of a nitrite. 11

, packaged the product will remain undiscolored.

4. That step-in the process of packaging in and non-acid aqueous contents containingasmall tin cans, non-acid aqueous products, which conquantity of a nitrite whereby the otherwise norsists in admixing with the product prior to packmal tendency of such contents to corrode the tin aging, a small amount of a nitrite whereby when can is inhibited to prevent discoloration of the contents. 5. A commercial package comprising a tin can IRWIN STONE. 

